Support multiple args with the `lx_*` function?

[findmyway]

It seems that the number of arguments with the lx_* function defined in utils.jl is hardcoded:

https://github.com/tlienart/Franklin.jl/blob/master/src/parser/latex/blocks.jl#L161

This makes it impossible to support multiple arguments in a latex command.

Though you provide a workaround here: #411 (comment)

\figure{path=“...”, alt=..., caption=“...”}

But this means one has to parse argument names and values by hand.

[tlienart]

right so the reason I did this is that when defining a command via \newcommand, you must explicitly pass the number of arguments. When defining a lx_* you don't specify this and so it's hardcoded to one.

You can see the extractor code in https://github.com/tlienart/PackagePage.jl/blob/master/src/utils.jl but I agree that it's maybe not the easiest.

I'll have a think about it. In theory it could be done by passing an optional kwarg to lx_* so that you'd define lx_*(com, _; nargs=2) but it needs to be done carefully.

(side note: I actually quite like passing named arguments to "latex-like" commands because it becomes more readable which is why I went down that route of parsing the content of the command but I agree that both things should be supported).